Albert Einstein wasn't always the old guy with the bushy white hair. Once upon a time he was once just a cute little three-year-old -- and the same is true, of course, for all scientific geniuses. Just have a look at this amazing collection of "baby scientist" photos HuffPost Science has assembled -- from legendary physicists and chemists to a celebrated chimp-lover and the first known computer program writer.

This stylish baby genius grew up to figure out a very important theory.

(1879-1955) Most famous for developing his theory of relativity and for the world's most famous equation, E = mc². Here he is on his 72nd birthday.

Who do you think this little boy, clutching a plant, could be?

(1809 – 1882) This English naturalist proposed a theory of evolution based on natural selection after studying species aboard the HMS Beagle.

Hint: This sassy lady's findings were quite radioactive.

(1867-1934) Famous for discovering polonium, uranium, and coming up with a theory of radioactivity, Marie Curie was the first woman to receive the Nobel prize.

This boy had some very bright ideas...

(1847-1931) Prolific inventor and businessman with over 1,093 patents, here Edison holds his most famous invention: the light bulb.

His research turned out to be explosive...

(1908–2003) Early member of the Manhattan Project, this controversial nuclear physicist helped invent one of the first atomic bombs and spearheaded the development of the H-bomb.

This boy wound up fighting with the scientist from the previous slide.

(1904-1967) J. Robert Oppenheimer puffs on a pipe during an interview at the Institute for Advanced Study in Princeton, N.J., April 5, 1963. Oppenheimer, scientist with the Manhattan Project that developed the first atom bomb, regretted his participation in the program in his later years. (AP)

Can't you tell from these amazing PANTS that he became a peace activist, too?

(1901-1994) Considered one of the most influential chemists in history, Pauling founded the fields of quantum chemistry and molecular biology. He was awarded the Nobel Prize in Chemistry in 1954 and the Nobel Peace Prize in 1962.

This baby loved chimps from the very beginning -- and she's never stopped.

(Born 1934) Considered the world's leading expert on chimpanzees, Goodall has studied their behavior ever since 1960. She has become a prominent advocate for conservation and animal welfare issues.

Would you believe that this prim boy ended up with 350 patents?

(1833-1896) Swedish chemist, engineer and innovator, Nobel invented dynamite. He is most famous for the prizes funded posthumously in his name.

It would be easier to make a pun about his discovery if he were wearing jeans.

(Born 1928) One half of the Watson and Crick duo (and let's not forget Rosalind Franklin too), this molecular biologist, geneticist and zoologist helped discover the structure of DNA.

She was a-maize-d by chromosomes.

(1902-1992) Considered the world's most distinguished cytogeneticist, McClintock studied what happens to chromosomes during the reproduction of maize. She is the only woman to have received an unshared Nobel Prize for Physiology or Medicine.

Can you guess who this is from her calculating look?

(1815-1852), Born Ada Augusta Byron, she was literary legend Lord Byron's only legitimate child. She was an avid mathematician and wrote what is considered the first computer program -- an algorithm intended to be processed by a machine.

We'd make a pun if the little boy were holding a cat in this photo...

(1887-1961) This Austrian quantum physicist is most famous for his namesake "Schrodinger's cat" formulation, and for his work on wave mechanics.

His pensive look here might foreshadow his future obsession with the unconscious...

(1856-1939) This neurologist and founding father of psychoanalysis developed many theories about the unconscious. While many of his ideas were controversial, they are considered to be some of the most influential of the 20th Century.

A hint: She followed in the footsteps of the last guy...

(1895-1982) Considered one of the founders of child psychoanalysis, Anna followed in her father's footsteps. Although she never pursued formal scientific training, she did receive an honorary M.D. and Sc.D.

This little boy in a sweater vest is still doing important work in physics today.

(Born 1942) Famous for his work on the radiation emitted from black holes -- now called Hawking radiation -- this theoretical astrophysicist set forth a cosmology that unites the theory of general relativity and quantum mechanics.

This child prodigy could already divide eight-digit numbers in his head when he was only six years old...

(1903-1957) An applied mathematician, von Neumann made contributions to many academic fields -- including mathematics, physics, statistics, economics, computer science, and even genetics.

That's one small step for a boy...

(1930-2012) As the first man to walk on the moon, this astronaut and aerospace engineer is most famous for uttering the phrase: "That's one small step for [a] man, one giant leap for mankind."